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      SpringBoot系列—自定义拦截器（九）
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        <p>&emsp;&emsp;拦截器拦截请求做额外的处理。</p>
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<p><strong>举个栗子：登录拦截器，拦截所有的请求，必须登录之后才能访问。</strong></p>
<div class="highlight-box"autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" contenteditable="true"data-rel="PLAIN"><figure class="iseeu highlight /plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line">package com.haichenyi.springbootbill.interceptors;</span><br><span class="line"></span><br><span class="line">import org.springframework.web.servlet.HandlerInterceptor;</span><br><span class="line"></span><br><span class="line">import javax.servlet.http.HttpServletRequest;</span><br><span class="line">import javax.servlet.http.HttpServletResponse;</span><br><span class="line"></span><br><span class="line">/**</span><br><span class="line"> * 登录拦截器</span><br><span class="line"> */</span><br><span class="line">public class LoginInterceptor implements HandlerInterceptor &#123;</span><br><span class="line">    @Override</span><br><span class="line">    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception &#123;</span><br><span class="line">        Object user = request.getSession().getAttribute(&quot;user&quot;);</span><br><span class="line">        if (user != null) &#123;</span><br><span class="line">            return true;</span><br><span class="line">        &#125;</span><br><span class="line">        request.setAttribute(&quot;msg&quot;, &quot;您还没有登录，请先登录！&quot;);</span><br><span class="line">        request.getRequestDispatcher(&quot;/index.html&quot;).forward(request, response);</span><br><span class="line">        return false;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></div>
<p>&emsp;&emsp;新建LoginInterceptor实现HandlerInterceptor接口。这个接口有三个方法，<strong>pre，post，after，</strong>  看这个名字就可以想到这三个方法是怎么调用的，发送请求前，发送过程中，发送请求成功之后，所以，根据自己的需求，实现对应的方法即可。</p>
<p>&emsp;&emsp;我这里是登录拦截器，所以，在发送请求之前就要拦截，走自己的逻辑，如果，没有登陆过，就跳转登录界面，所以，我这里就实现了发送请求之前的回调，即preHandle方法。</p>
<p>&emsp;&emsp;然后，在你的SpringMvcConfiguration里面加上拦截器即可。</p>
<div class="highlight-box"autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" contenteditable="true"data-rel="PLAIN"><figure class="iseeu highlight /plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br></pre></td><td class="code"><pre><span class="line">package com.haichenyi.springbootbill.config;</span><br><span class="line"></span><br><span class="line">import com.haichenyi.springbootbill.component.MyLocalResolver;</span><br><span class="line">import com.haichenyi.springbootbill.interceptors.LoginInterceptor;</span><br><span class="line">import org.springframework.context.annotation.Bean;</span><br><span class="line">import org.springframework.context.annotation.Configuration;</span><br><span class="line">import org.springframework.web.servlet.LocaleResolver;</span><br><span class="line">import org.springframework.web.servlet.config.annotation.InterceptorRegistry;</span><br><span class="line">import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;</span><br><span class="line">import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;</span><br><span class="line"></span><br><span class="line">@Configuration</span><br><span class="line">public class MySpringMvcConfig &#123;</span><br><span class="line"></span><br><span class="line">    @Bean</span><br><span class="line">    public WebMvcConfigurer webMvcConfigurer() &#123;</span><br><span class="line">        return new WebMvcConfigurer() &#123;</span><br><span class="line">            @Override</span><br><span class="line">            public void addViewControllers(ViewControllerRegistry registry) &#123;</span><br><span class="line">                registry.addViewController(&quot;/&quot;).setViewName(&quot;main/login&quot;);</span><br><span class="line">                registry.addViewController(&quot;/index.html&quot;).setViewName(&quot;main/login&quot;);</span><br><span class="line">                registry.addViewController(&quot;/main/index.html&quot;).setViewName(&quot;main/index&quot;);</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">            @Override</span><br><span class="line">            public void addInterceptors(InterceptorRegistry registry) &#123;</span><br><span class="line">                registry.addInterceptor(new LoginInterceptor())</span><br><span class="line">                        .addPathPatterns(&quot;/**&quot;)</span><br><span class="line">                        .excludePathPatterns(&quot;/&quot;, &quot;/index.html&quot;, &quot;/login&quot;)</span><br><span class="line">                        .excludePathPatterns(&quot;/css/*&quot;,&quot;/img/*&quot;,&quot;/images/*&quot;,&quot;/js/*&quot;);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    @Bean</span><br><span class="line">    public LocaleResolver localeResolver() &#123;</span><br><span class="line">        return new MyLocalResolver();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></div>
<p>&emsp;&emsp;实现addInterceptors方法，添加拦截器，然后添加了  <strong>addPathPatterns</strong> 拦截所有带这个参数的请求。接着，又添加了 <strong>excludePathPatterns</strong> 不拦截所有带这个参数的请求。</p>

      
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